For a feature on BBC1's The One Show we sent adventure presenter Andy Torbet down this 30 metre waterfall, illuminated only by high-luminance glowsticks. My confidence in the A7s is high, so I shot multiple sequential frames at high ISO, to make sure the glowsticks really left their mark in the scene. Even at ISO1600 there's comfortable processing latitude and plenty of opportunity to recover highlights & lift shadows. Sony Zeiss 16-35mm at 24mm. The feature about making this image remains on iPlayer for a few more days (http://www.bbc.co.uk/iplayer/episode/b06157g8/the-one-show-09072015)
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